WO2002092243B1 - Improved short dwell time coater and method - Google Patents

Improved short dwell time coater and method

Info

Publication number
WO2002092243B1
WO2002092243B1 PCT/US2002/014962 US0214962W WO02092243B1 WO 2002092243 B1 WO2002092243 B1 WO 2002092243B1 US 0214962 W US0214962 W US 0214962W WO 02092243 B1 WO02092243 B1 WO 02092243B1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
moving surface
coater
moving
roll
Prior art date
Application number
PCT/US2002/014962
Other languages
French (fr)
Other versions
WO2002092243A1 (en
Inventor
Wayne A Damrau
Original Assignee
Stora Enso North America Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stora Enso North America Corp filed Critical Stora Enso North America Corp
Publication of WO2002092243A1 publication Critical patent/WO2002092243A1/en
Publication of WO2002092243B1 publication Critical patent/WO2002092243B1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters
    • D21H23/36—Knife or blade forming part of the fluid reservoir, e.g. puddle-type trailing blade or short-dwell coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Paper (AREA)

Abstract

An improved short dwell type coater (18) and method are provided. The coater (18) can coat a web (26) directly or a moving roll surface (26' or 27') as in a film coater or size press. The flow path in the coater includes a flow modifier (54) shaped to have the introduced coating first turn upstream relative to the web (26) or roll surface (26' or 27'), then turn across a curved surface (73, 74) toward the web (26) or roll (26' or 27') and around the flow modifier (54). The flow then converges toward the top of the flow modifier (54) and passes the tip (63) of the flow modifier. Some flow remains on the web (26) or roll (26' or 27') and is subsequently doctored, while most is turned away from the web (26) or roll (26' or 27') and merged with the incoming flow. A gap (46) filled with coating overflow provides a liquid seal. This coater and method use coating, reduce vortices and streaking, and can operate at higher speeds.

Claims

AMENDED CLAIMS
[received by the International Bureau on 18 October 2002 (18.10.02); original claim 1, 4, 7, 28, 31 , 34, 40, 64, 67, 78 and 84 amended; remaining claims unchanged (8 pages )]
1. A method for applying a coating to a moving surface, comprising the steps of supplying coating under pressure to a coater head, causing the coating to flow downstream with respect to coating flow and in an opposite direction of moving surface travel, causing the coating to flow toward the moving surface, applying some of the coating to the moving surface, the other of the coating turning away from the moving surface toward the locale where the coating first flowed downstream with respect to coating flow and in an opposite direction of moving surface travel, merging the returning coating with the coating flowing downstream with respect to coating flow and in an opposite direction of moving surface travel, directing the coating applied to the moving surface toward a doctor, removing some of the coating applied to the moving surface with the doctor and permitting the remainder of the coating of a desired coat weight to pass by the doctor, whereby the coating applied to the moving surface has a reduced tendency to form vortices therein and streaking. 2. The method as in claim 1, wherein said moving surface is a moving web of paper.
3. The process as in claim 1, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
4. The method of claim 1, wherein the step of causing the coating to flow downstream with respect to coating flow and in an opposite direction of moving surface travel, and returning the other of said coating to said locale, comprises the step of causing the coating to turn around a flow member.
5. The method as in claim 4, wherein said moving surface is a moving web of paper. 6. The method as in claim 4, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
7. The method of claim 1, providing an additional step of causing an overflow of coating from that flowing toward the moving surface to wet the moving surface as it enters the coater. 8. The method as in claim 1, wherein said moving surface is a moving web of paper.
9. The method as in claim 7, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
25. The method of claim 22, wherein the step of doctoring comprising doctoring the coating with a grooved doctor roll.
26. The method as in claim 25, wherein said moving surface is a moving web of paper. 27. The method as in claim 25, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
28. The method of claim 1, wherein the step of causing the coating to flow downstream with respect to coating flow and in an opposite direction of moving surface travel includes the step of passing the coating by supports for locating a flow member. 29. The method as in claim 28, wherein said moving surface is a moving web of paper.
30. The method as in claim 28, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
31. The method of claim 28, wherein the step of passing comprising passing the coating through a plurality of openings extending in the coater across the width of the moving surface.
32. The method as in claim 31, wherein said moving surface is a moving web of paper.
33. The method as in claim 31, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
34. A coater for applying a coating to a moving surface, comprising a coater head for supplying coating under pressure to the moving surface, said coater having a first flow path for causing the coating to flow downstream with respect to coating flow and in an opposite direction of moving surface travel, said flow path then turning toward the moving surface for causing the coating to flow toward the moving surface, said coater head having an application zone adjacent the moving surface for applying at least some of the coating to the moving surface, the coater head having a return path flowing from the application zone toward the first flow path where the coating first flowed downstream with respect to coating flow and in an opposite direction of the moving surface travel, the return path returning coating flowing in a direction away from the moving surface and merging into the first flow path, a doctor at the rear of the application zone for removing some of the coating applied to the moving surface with the doctor and permitting the remainder of the coating of a desired coat weight to pass by the doctor, whereby the coater can apply coating to the moving surface with a reduced tendency to form vortices therein and streaking.
35. The coater of claim 34, wherein said moving surface is a moving web of paper.
36. The coater of claim 34, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper. 37. The coater of claim 34, further comprising a flow member generally surrounded by the flow path, the application zone and the return path, whereby the coating can flow around said flow member.
38. The coater of claim 37, wherein said moving surface is a moving web of paper. 39. The coater or claim 37, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
40. The coater of claim 34, comprising a spaced gap between the moving surface and coater head for permitting an overflow of coating from that headed toward the moving surface to wet the moving surface as it enters the coater. 41. The coater of claim 40, where said moving surface is a moving web of paper.
42. The coater of claim 40, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
43. The coater of claim 38, including means for adjusting the amount of overflow through the gap to a desired level.
44. The coater of claim 43, wherein said moving surface is a moving web of paper.
45. The coater of claim 43, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper. 46. The coater of claim 34, wherein said doctor comprises a doctor blade for blading the coating.
47. The coater of claim 46, wherein said moving surface is a moving web of paper.
being adapted to transfer some of the coating to a moving web of paper.
64. The coater of claim 61, wherein said support includes a plurality of openings extending in the coater across the width of the moving surface, said plurality of openings passing the coating therethrough and permitting coating flow around said flow member.
65. The coater of claim 64, wherein said moving surface is a moving web of paper.
66. The coater of claim 64, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper. 67. A method for applying a coating to a moving surface, comprising the steps of supplying coating under pressure to a coater head, causing the coating to flow from a locale downstream with respect to coating flow and against the direction of moving surface travel, causing the coating to flow toward the moving surface, causing an overflow of some of coating from that headed toward the moving surface to wet the moving surface as it enters the coater, adjusting the amount of overflow to a desired level, applying some of the remaining coating to the moving surface, flowing the remaining coating in the direction of web travel, and returning the coating to said locale, turning the coating around a flow member, the other of the coating turning away from the moving surface toward said locale where the coating first flowed in a direction downstream of the moving surface, merging the returning coating with the coating flowing in a downstream moving direction, causing the coating to flow upstream of the direction of web travel includes the step of passing the coating by supports for locating a flow member, directing the coating applied to the moving surface toward a doctor, removing some of the coating applied to the moving surface with the doctor and letting the remainder of the coating of a desired coat weight pass by the doctor, whereby the coating applied to the moving surface has a reduced tendency to form vortices therein and streaking.
68. The method of claim 67, wherein the step of doctoring comprising blading the coating with a doctor blade. 69. The method of claim 64, wherein the step of doctoring comprises blading the coating with a bent blade.
70. The method of claim 68, wherein the step of doctoring comprises the step of doctoring the coating with a flexible blade.
71. The method of claim 68, wherein the step of doctoring comprises doctoring the coating with a doctor roll. 72. The method of claim 71, wherein the step of doctoring comprising doctoring the coating with a grooved doctor roll.
73. The method of claim 67, wherein comprising passing the coating through a plurality of openings extending in the coater across the width of the moving surface. 74. The method of claim 73, wherein said moving surface is a moving web of paper.
75. The method of claim 73, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
76. The method of claim 67, wherein said moving surface is a moving web of paper.
77. The method of claim 67, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
78. A coater for applying a coating to a moving surface, comprising a coater head for supplying coating under pressure to the moving surface, said coater head having a flow path from a locale for causing the coating to flow downstream with respect to coating flow and against the direction of moving surface travel, said flow path then turning toward the moving surface for causing the coating to flow toward the moving surface, said coater head having an application zone adjacent the moving surface for applying at least some of the coating to the moving surface, the coater head having a return path flowing from the application zone toward said locale of the flow path, the return path merging at said locale into the flow path with the coating flowing downstream with respect to coating flow and against the direction of moving surface travel, a flow member generally surrounded by the flow path, the application zone and the return path, whereby the coating can flow around said flow member, a spaced gap between the moving surface and coater head for permitting an overflow of coating from the locale and that headed toward the moving surface to wet the moving surface as it enters the coater, supports for locating said flow member, said supports being attached to said coater head, a doctor at the rear of the application zone for removing some of the coating applied to the moving surface with the doctor and letting some of the coating of a desired coating weight pass by the doctor, whereby the coater can apply coating to the moving web with a reduced tendency to form vortices therein and streaking.
79. The coater of claim 78, wherein said doctor comprises a doctor blade for blading the coating.
80. The coater of claim 79, wherein said doctor comprises a bent blade for blading the coating.
81. The coater of claim 79, wherein said doctor comprises a flexible blade for blading the coating.
82. The coater of claim 79, wherein said doctor comprises a doctor roll for doctoring the coating. 83. The coater of claim 82, wherein said doctor roll includes one or more grooves therein.
84. The coater of claim 78, wherein said support includes a plurality of openings extending in the coater across the width of the moving surface, said plurality of openings passing the coating therethrough for travel around said flow member. 85. The coater of claim 84, wherein said moving surface is a moving web of paper.
86. The coater of claim 84, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
87. The coater of claim 78, wherein said moving surface is a moving web of paper.
88. The coater of claim 78, wherein said moving surface is a roll, said roll being adapted to transfer some of the coating to a moving web of paper.
PCT/US2002/014962 2001-05-16 2002-05-13 Improved short dwell time coater and method WO2002092243A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/859,061 2001-05-16
US09/859,061 US20020172771A1 (en) 2001-05-16 2001-05-16 Short dwell time coater and method

Publications (2)

Publication Number Publication Date
WO2002092243A1 WO2002092243A1 (en) 2002-11-21
WO2002092243B1 true WO2002092243B1 (en) 2002-12-19

Family

ID=25329910

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/014962 WO2002092243A1 (en) 2001-05-16 2002-05-13 Improved short dwell time coater and method

Country Status (2)

Country Link
US (1) US20020172771A1 (en)
WO (1) WO2002092243A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004028755A1 (en) * 2004-06-16 2006-01-12 Voith Paper Patent Gmbh applicator
US7823530B2 (en) * 2007-12-27 2010-11-02 Chung Yuan Christian University Adjustable film applicator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4369731A (en) * 1981-09-02 1983-01-25 Consolidated Papers, Inc. Coating apparatus having an internal leveling blade
FI93885C (en) * 1992-05-21 1995-06-12 Valmet Paper Machinery Inc Coating device for coating a roll of glue press, paper or board
US5665163A (en) * 1995-08-22 1997-09-09 Beloit Technologies, Inc. Film applicator with entrained air removal and surface control
US5824369A (en) * 1996-06-24 1998-10-20 Beloit Technologies, Inc. Method and apparatus for coating a traveling paper web
US6152069A (en) * 1998-04-06 2000-11-28 Beloit Technologies, Inc. Multi-chamber short dwell coater

Also Published As

Publication number Publication date
US20020172771A1 (en) 2002-11-21
WO2002092243A1 (en) 2002-11-21

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